One year's experience with programmed oocyte retrieval for IVF.

We have previously described a simplified form of ovulation stimulation for IVF in which the day of presumed oocyte retrieval is determined several weeks in advance. This paper retrospectively analyses this technique in 296 unselected patients over a one year period to assess if the method is suitable for routine use in an IVF programme. Oocyte retrieval was performed on the predetermined day in 70% of patients commencing stimulation. In the remainder, the presumptive day of oocyte retrieval was modified, or the cycle was cancelled. Compared with 356 patients undergoing a comparable classically monitored IVF stimulation during the same period, there was no significant difference in the cancellation rate of cycles prior to oocyte recovery, in the numbers of oocytes or embryos obtained or in the pregnancy rate between the two populations. It is concluded that programmed oocyte retrieval does not have a deleterious effect on the success rate of IVF compared with classical clomiphene citrate/HMG stimulation and it considerably facilitates the administration of an IVF programme.